Issue #23659: Document **fmtparams in csv.register_dialect docstring.
Initial patch by Brandon Milam.
diff --git a/Modules/_csv.c b/Modules/_csv.c
index c8767d1..7a71564 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -1589,7 +1589,7 @@
PyDoc_STRVAR(csv_register_dialect_doc,
"Create a mapping from a string name to a dialect class.\n"
-" dialect = csv.register_dialect(name, dialect)");
+" dialect = csv.register_dialect(name[, dialect[, **fmtparams]])");
PyDoc_STRVAR(csv_unregister_dialect_doc,
"Delete the name/dialect mapping associated with a string name.\n"